Firstly, I need it to be noted, that I HATE travel bloggers who post about selecting the right backpack! It is an extremely boring post topic, and clearly written by most travelers because they have either scored a free backpack, or they want to. I recommended the “UltraGlide 1000″ because…!!
I guarantee this post is NOT like them! I thought it may actually be useful to the 40 plus long term traveler to share a few of my experiences with different types of luggage, and how they work for the long term traveler, who just happens to be 40 or more. I have done overland travel with a backpack, with duffel bags, and with suitcases, and am going to give a quick summary of each, with advantages and disadvantages (in order of worst to best) -

Duffle Bag, Backpack and suitcases!
Duffel Bags – On our first trip to Vietnam, we decided Duffel bags would be a good way to go. Our reasoning was we would be on and off buses and trains for most of the trip, and they would be easy to throw into luggage holds, and to sit and lie on if necessary. What we failed to consider, is that they are quite awkward to carry, as you need to hold them out from your body, that most hotels in Vietnam at the time were multistory, but did not have lifts, and that I was travelling with my 48kg wife and 13 year old daughter! Ultimately, the disadvantages of the Duffel bag, far outweighed the advantages, and I can think of very few times when a duffel bag would be the best option (except when you join the army!!)
Backpack – well, when you are in the back-blocks, it is what everyone else is carrying. They Are of various sizes,and sometimes you wonder how young girls are keeping these things on their backs! The answer is, THEY ARE 20!! The only time the backpack is the best option for a 40 plus traveler, is when you genuinely need to carry your luggage over a considerable distance. We carried a backpack when we did the Annapurna Base Camp trek, as we left the road on day one, and didn’t see a vehicle or road for the next 9. In that case, you need to carry you ESSENTIALS with you, so at least a backpack spreads the weight over you shoulders, where you can bear the most weight. However, even in this case, we carries only day-packs, and paid a porter to carry our backpack! If you are over 40, ONLY carry a backpack in extreme circumstances, as once you put all your gear on your back, it is f!!!ing heavy!!

Backpacks are great (when your porter carries it!)
Suitcase – I know, it is such a boring piece of luggage!, but honestly, it is by a country mile, the best option in 99.5% of situations. We now ALWAYS carry a small (around 70l) suitcase each, with an extend-able pull handle, and on wheels (they all are now, anyway). It doesn’t look cool, but, honestly, as a 40 plus year old traveler, you are not going to look cool anyway! (get a tattoo if you want to). On a couple of occasions, when catching a water taxi between islands in Thailand and Indonesia, and having to get off the boat 20 meters from shore, suitcases have been humiliating, but as soon as you are on a solid road, you luggage choice is validated immediately! On arriving at Railay beach once, we were embarrassed to try any carry suitcases out of the water and up a busy beach, but once we had to walk around for an hour to find accommodation, we were more than happy to be able to pull our luggage around!
So, I am not talking brands or features (Hello, sponsorship opportunity??), I might later (sic). But I just, really, cant see many situations, where a 40 year old, long term traveler, would not be best suited with a nice, small and portable suitcase (and a day-pack - I recommend the MaxiGlide1000)! Anywho, enough of my chatter, what do you think??